Directions:Refresh, cleanse and invigorate with pure essential oils whenever you travel. Use with pure, natural essential oils.1. Gently pull off the vented end.2. Apply 5 drops of a pure essential oil or synergy blend to the cellulose pad.3. Insert the cellulose pad along the guide rail of the vented end.4. Replace the cover5. Plug the metal end of the diffuser into your car's lighter socket. The red light is on while diffusing. Unplug the diffuser when you leave the car.